Add missing effects. Adds BUKKIT-5652.

##### The Issue:
Adds new effects introduced on Minecraft.

##### Justification for this PR:
There is no direct way to employ the new effects, as Bukkit does not provide a way to send effects packets with a certain ID.

##### PR Breakdown:
Handle the speed integer for LAND_DUST.

##### Relevant PR(s): 
B-1074 - https://github.com/Bukkit/Bukkit/pull/1074/

##### JIRA Ticket: 
BUKKIT-4349 - https://bukkit.atlassian.net/browse/BUKKIT-4349
BUKKIT-5652 - https://bukkit.atlassian.net/browse/BUKKIT-5652

Any particular reason this hasn't come up before?